Power conversion system

Abstract

A power conversion system includes: a plurality of power modules connected in parallel to each other; a plurality of drive circuits driving the plurality of power modules based on input signals respectively; a plurality of correction sections correcting the input signals inputted to the plurality of drive circuits based on a plurality of correction values respectively; a temperature detection section detecting operating temperatures of the plurality of power modules; and a calculation section estimating current switching characteristics of the plurality of power modules based on the measured operating temperatures and temperature dependency of switching characteristics of the plurality of power modules, and calculating the plurality of correction values based on the estimated current switching characteristics so as to reduce variations of currents flowing through the plurality of power modules.

The invention claimed is: 
     
       1. A power conversion system comprising:
 a plurality of power modules connected in parallel to each other; 
 a plurality of drive circuits driving the plurality of power modules based on input signals respectively; 
 a plurality of correction sections correcting the input signals inputted to the plurality of drive circuits based on a plurality of correction values respectively; 
 a temperature detection section detecting operating temperatures of the plurality of power modules; and 
 a calculation section estimating current switching characteristics of the plurality of power modules based on the detected operating temperatures and temperature dependencies of switching characteristics of the plurality of power modules, and calculating the plurality of correction values based on the estimated current switching characteristics so as to reduce variations of currents flowing through the plurality of power modules, wherein 
 the switching characteristic is at least one of a rising time, a falling time, a time period required to turn on, a time period required to turn off, a turn-on delay time, a turn-off delay time, a total value of a turn-on delay time and a rising time, and a total value of a turn-off delay time and a falling time. 
 
     
     
       2. The power conversion system according to  claim 1 , further comprising a recording section recording inspection results of switching characteristics of the plurality of power modules and inspection temperatures as shipment inspection results,
 wherein the calculation section estimates the temperature dependencies of the switching characteristics of the plurality of power modules based on the shipment inspection results. 
 
     
     
       3. The power conversion system according to  claim 2 , wherein the recording section includes a plurality of recording sections provided in the plurality of power modules respectively and recording the shipment inspection results of the plurality of power modules respectively. 
     
     
       4. The power conversion system according to  claim 3 , wherein the plurality of drive circuits and the plurality of correction sections are provided in the plurality of power modules respectively, and
 the plurality of recording sections records the plurality of calculated correction values respectively. 
 
     
     
       5. The power conversion system according to  claim 4 , wherein the plurality of power modules includes a plurality of switching devices made of a wide-band-gap semiconductor respectively. 
     
     
       6. The power conversion system according to  claim 3 , wherein the plurality of power modules includes a plurality of switching devices made of a wide-band-gap semiconductor respectively. 
     
     
       7. The power conversion system according to  claim 2 , wherein the plurality of power modules includes a plurality of switching devices made of a wide-band-gap semiconductor respectively. 
     
     
       8. The power conversion system according to  claim 1 , wherein the plurality of power modules includes a plurality of switching devices made of a wide-band-gap semiconductor respectively. 
     
     
       9. A power conversion system comprising:
 a plurality of power modules connected in parallel to each other; 
 a plurality of drive circuits driving the plurality of power modules based on input signals respectively; 
 a plurality of correction sections correcting the input signals inputted to the plurality of drive circuits based on a plurality of correction values respectively; 
 a temperature detection section detecting operating temperatures of the plurality of power modules; 
 a calculation section estimating current switching characteristics of the plurality of power modules based on the detected operating temperatures and temperature dependencies of switching characteristics of the plurality of power modules, and calculating the plurality of correction values based on the estimated current switching characteristics so as to reduce variations of currents flowing through the plurality of power modules; and 
 a recording section recording inspection results of switching characteristics of the plurality of power modules and inspection temperatures as shipment inspection results, wherein 
 the calculation section estimates the temperature dependencies of the switching characteristics of the plurality of power modules based on the shipment inspection results. 
 
     
     
       10. The power conversion system according to  claim 9 , wherein the recording section includes a plurality of recording sections provided in the plurality of power modules respectively and recording the shipment inspection results of the plurality of power modules respectively. 
     
     
       11. The power conversion system according to  claim 10 , wherein the plurality of drive circuits and the plurality of correction sections are provided in the plurality of power modules respectively, and
 the plurality of recording sections records the plurality of calculated correction values respectively. 
 
     
     
       12. The power conversion system according to  claim 11 , wherein the plurality of power modules includes a plurality of switching devices made of a wide-band-gap semiconductor respectively. 
     
     
       13. The power conversion system according to  claim 10 , wherein the plurality of power modules includes a plurality of switching devices made of a wide-band-gap semiconductor respectively. 
     
     
       14. The power conversion system according to  claim 9 , wherein the plurality of power modules includes a plurality of switching devices made of a wide-band-gap semiconductor respectively.